Question

I have a table valued function which returns the boss of a person for a given day.

dbo.Bosses(@empId, @date)

How do I loop through this function with information from another?

I.e, I want to use Table B that has a date and employee Id and I want to use them as arguments to find all the bosses for each day inputted in Table B

Table B
EmpId     int
hours     float
day       datetime
creator   int

Answer 1

Assuming you have SQL Server 2005+

SELECT
  *
FROM
  TableB
CROSS APPLY
  dbo.Bosses(TableB.EmpID, TableB.day) AS bosses

CROSS APPLY will only return results where the Bosses function returns results. Similary to an INNER JOIN.

OUTER APPLY will return results for every entry in TableB, similar to a LEFT JOIN.